Yes, Sigma battery charger will automatically go into maintenance mode once the battery is fully charged and can be left connected to the battery indefinitely.
Please rest assured that it is safe. The Sigma battery charger features 5 safety protections:
- Reverse Polarity Protection
- Short Circuit Protection
- High-Temp protection
- Over-Voltage Protection
- Over-Current Protection
Note: It is recommended to charge your battery indoors. Please follow the safety reminders in the user manual.